Búsqueda Imágenes Maps Play YouTube Noticias Gmail Drive Más »
Iniciar sesión
Usuarios de lectores de pantalla: deben hacer clic en este enlace para utilizar el modo de accesibilidad. Este modo tiene las mismas funciones esenciales pero funciona mejor con el lector.

Patentes

  1. Búsqueda avanzada de patentes
Número de publicaciónUS3871728 A
Tipo de publicaciónConcesión
Fecha de publicación18 Mar 1975
Fecha de presentación30 Nov 1973
Fecha de prioridad30 Nov 1973
También publicado comoCA1028401A1, DE2455619A1
Número de publicaciónUS 3871728 A, US 3871728A, US-A-3871728, US3871728 A, US3871728A
InventoresDavid S Goodman
Cesionario originalItt
Exportar citaBiBTeX, EndNote, RefMan
Enlaces externos: USPTO, Cesión de USPTO, Espacenet
Matched impedance printed circuit board connector
US 3871728 A
Resumen
A matched impedance printed circuit board connector comprising a housing mounted on a mounting board having a ground plane and signal traces separated by an insulator. A grounding bus extends lengthwise in the housing below the printed circuit board receiving slot therein. Signal contacts in the housing are mounted in plated through holes in the mounting board which are connected to the signal traces. The grounding bus has mounting portions which are mounted in other plated through holes in the board which are joined to the ground plane. Ground contacts are also provided in the housing which are mounted in additional plated through holes which are also joined to the ground plane so that the ground contacts and grounding bus are electrically interconnected. Preferably two such ground contacts are positioned on opposite sides of the signal contacts.
Imágenes(2)
Previous page
Next page
Descripción  (El texto procesado por OCR puede contener errores)

United States Patent [191 Goodman MATCHED IMPEDANCE PRINTED CIRCUIT BOARD CONNECTOR David S. Goodman, Orange, Calif.

Assignee: International Telephone and Telegraph Corporation, New York, N.Y.

Inventor:

Filed: 7 Nov. 30, 1973 Appl. No.: 420,532

US. Cl 339/14 R, 339/17, 339/19, 339/176 MP, 339/217 R Int. Cl. H01v 3/06, H051: 1/07 Field of Search 339/14, 17, 18, 19, 75, 339/176, 186, 184, 177, 21

References Cited UNITED STATES PATENTS Mar. 18, 1975 3,778,754 12/1973 Takahashi et a1. 339/176 M Primary Examiner-William H. Schultz Assistant Examiner-Terrell P. Lewis Attorney, Agent, or Firm-Thomas L. Peterson [57] ABSTRACT A matched impedance printed circuit board connector comprising a housing mounted on a mounting board having a ground plane and signal traces separated by an insulator. A grounding bus extends lengthwise in the housing below the printed circuit board receiving slot therein. Signal contacts in the housing are mounted in plated through holes in the mounting board which are connected to the signal traces. The grounding bus has mounting portions which are mounted in other plated through holes in the board which are joined to the ground plane. Ground contacts are also provided in the housing which are mounted in additional plated through holes which are also joined to the ground plane so that the ground contacts and grounding bus are electrically interconnected. Preferably two such ground contacts are positioned on opposite sides of the signal contacts.

8 Claims, 4 Drawing, Figures Ni ll E IE" I MATCI-IED IMPEDANCE PRINTED CIRCUIT BOARD CONNECTOR BACKGROUND OF THE INVENTION The present invention relates generally to a printed circuit board connector and, more particularly, to such a connector which embodies matched impedance characteristics.

Modern data processing systems require that logic decisions be made in a matter of nanoseconds rather than milli or microseconds. In this range of decision speed, circuit designers have found that signal rise times are so fast as to require the utilization of transmission line techniques. While printed circuit boards have previously been manufactured with no particular attention to the impedance characteristics of the circuit lines, printed circuits must now be constructed with all the characteristics of transmission lines, with signal conductors placed a known preset distance from a reference ground plane and terminated to prevent reflections. While printed circuit boards can be built with these characteristics, unless the entire packaging system is provided with the desired transmission line characteristics, the overall system is degraded and is unable to achieve the desired operating speed.

One weak area in packaging systems has been the connectors which interconnect circuit boards to various other portions of the system. One technique used in the art for providing transmission line interconnections between printed circuit boards employs discreet coaxial cables which must be individually connected between the boards. This technique is disclosed in detail in US. Pat. No. No. 3,689,865. While satisfactory from a technical standpoint, this technique leaves much to be desired on the basis of reliability and cost. Moreover, such connectors are bulky and reduce the interconnection density to an undesirable low level. Other types of printed circuit boards designed to maintain circuit line impedance characteristics are disclosed in US Pat. Nos. 3,401,369 and 3,710,303. While these connectors constitute improvements upon the connectors employing discreet coaxial cables, such connectors are limited in their flexibility of design.

The present invention constitutes an improvement upon the printed circuit board connector disclosed in US. Pat. No. 3,737,838 to Mattingly et al, assigned to the assignee as the present application, by modifying such connector so that it embodies matched impedance characteristics. The connector is relatively low in cost and embodies greater flexibility in design than does the prior art matched impedance connectors discussed above.

SUMMARY OF THE INVENTION According to the principal aspect of the present invention, there is provided a matched impedance printed circuit board connector comprising a mounting board having a ground plane and signal traces separated by an insulator. An insulative housing is mounted on the board having a slot therein for receiving the edge of a printed circuit board. A vertically extending grounding bus extends lengthwise in the housing below such slot. Signal contacts are mounted in plated through holes in the mounting board which are joined to the signal traces. The grounding bus and ground contacts in the housing are mounted in plated through holes in the mounting board which are joined to the ground plane whereby the ground contacts and grounding bus are electrically interconnected. The grounding bus minimizes the air gap in the ground system, that is, between the ground traces on the edge board which is mounted in the connector and the ground plane in the mounting board. Preferably the ground contacts are mounted on opposite sides of each signal contact so that the ground contacts, together with the grounding bus, provide an arrangement simulating a coaxial transmission line, thus producing essentially matched impedance characteristics.

Other aspects and advantages of the invention will become more apparent from the following description taken in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a longitudinal partial vertical sectional view showing the connector assembly of the present invention;

FIG. 2 is a transverse vertical sectional view taken along line 22 of FIG. 1, with the edge ofa printed circuit board being shown mounted in the connector;

FIG. 3 is an enlarged fragmentary perspective view of the connector of the invention with the edge of a printed circuit board mounted therein; and

FIG. 4 is a schematic illustration of a preferred arrangement of the ground and signal contacts in the connector of the present invention with respect to the grounding bus therein.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings in detail, there is illus trated in FIG. 1 the preferred embodiment of the connector assembly of the present invention, comprising an elongated insulative connector housing 10 mounted on a planar mounting board 12. The connector is shown as being a double-sided printed circuit board connector. Two parallel rows of plated through holes 14 and 16, respectively, extend perpendicularly through the board 12. Adapted to be positioned in each of the holes are a plurality of electrical contacts 18. The contacts are formed of a terminal portion 20 and spring contacting portion 22, with the portions 20 and 22 being interconnected by a central mounting portion 24. The contacts are mounted in the holes 14 and 16 as opposed pairs with the contacting portions thereof positioned closely adjacent to each other. The contacts are preferably stamped from suitable metal stock to provide the desired strength.

The terminal portions 20 of the contacts are generally square in cross section and may be tapered at their tip ends 26 to facilitate insertion of the contacts into the holes 14 and 16. The spring contacting portions are shown as being bifurcated by means of slots 28 which open at the tip end 30. The bifurcated spring contacting portions of the opposed pairs of contacts provide redundant contact points to conductive traces 32 and 33 on opposite sides of a printed circuit board 34 inserted through a slot 36 in the top of the housing 10. In the embodiment illustrated, the trace 32 is a ground trace and the trace 33 is a signal trace. The spring portion 22 contains a shank end 38 which interconnects the mounting portion 24 to the bifurcated end of the contact. Normally the spring portion is tapered from the shank end 38 to the outer tip end 30 ofthe contact.

The central mounting portion 24 which interconnects the shank end 38 and the terminal portion 18 is of an approximately equal thickness. However, the mounting portion is slightly wider than the shank end 38 at their junction so as to define an upwardly facing shoulder 40. At its junction with the terminal portion 20, tapered transitional section 42 provides the width transition between the terminal portion and the lower end 44 of the mounting portion. The lower end 44 of the mounting portion is not as wide as the upper end 46, thereby defining a downwardly facing shoulder 48. The width of the lower end 44 is approximately equal to the diameter of the holes 14 and 16 so that when the contacts are inserted into the holes, the shoulder 48 will rest on the top surface of the mounting board 12 correctly positioning the contacts thereon. The width of the lower end 44 of the mounting portion of each contact is slightly greater than the diameter of the plated through holes 14 and 16 so that the contact will have an interference fit with the holes.

The housing includes a pair of sidewalls 64 and end walls 66. The side walls 64 terminate at a top wall 68. The printed circuit board receiving slot 36 is formed in this top wall and splits the wall into symmetrical portions. Downwardly depending lips 70 are formed along the symmetrical portions of the top wall 68 adjacent to the slot 36. These lip portions engage the upper ends 30 of the contacts to preload the same when the housing 10 is mounted over the contacts onto the board 12. The housing is retained on the board by the frictional engagement between the upper ends 46 of the mounting portions 24 of the contacts and downwardly facing slots 72 formed in partition walls 74 which extend laterally in the housing and define the cavities for receiving the contacts.

It should be noted that the connector assembly described so far is essentially identical to that described and disclosed in the aforementioned Mattingly et al. patent, and constitutes no part of the present invention.

In accordance with the present invention, the mounting board 12 is constructed as a two-layer laminate, the upper layer 80 being separated from the lower layer 82 by a ground plane 84 which preferably extends to the edges of the board. Each contact which is intended to carry an electrical signal, such as the contact 18 on the left side of the connector housing as viewed in FIGS. 2 and 3, is mounted in a plated through hole 14 which is joined to a signal trace 85 on the top surface of the board 12. Each contact which is intended to provide a ground connection. such as the contact 18 on the right side of the housing as viewed in FIGS. 2 and 3, is mounted in a plated through hole 16 which is joined to the ground plane 84. It is noted that the plated through hole for each signal contact is spaced from the ground plane 84 while the plated through hole for each ground contact is spaced from the signal trace 85.

The lower portion of the housing 10 is formed with an inverted channel 86 intermediate the side walls 64 and below the slot 36. This channel extends between the end walls 66. The upper wall of the channel 88 is disposed below the slot 36 and forms a stop for the printed circuit board 34.

A grounding bus 90 is mounted in the channel 86. The bus comprises an elongated flat vertically extending metal strip which has downwardly depending mounting portions 92 and terminal ends 94 which have a configuration corresponding to the mounting portions 24 and terminal ends 20 of the contacts 18. A third row of plated through holes are provided in the board 12 midway between the rows 14 and 16 of plated through holes. The mounting portions 92 of the grounding bus are press-fit into the plated through holes 96. These holes are joined to the ground plane 84. Thus, it will be appreciated that the contacts 18 and the ground bus 90 are electrically connected to the ground plane by the plated through holes 16 and 96. Since the upper edge of the ground bus 90 is separated from the lower end of the ground trace 32 on the printed circuit board 34 by only the upper wall 88 of the channel 86, only a very small air gap is provided in the ground system, thereby providing matched impedance characteristics in the connector.

Reference is now made to FIG. 4 which schematically illustrates the preferred arrangement of the contacts in the connector of the present invention with respect to the grounding bus 90. Those contacts which are intended for carrying signals are designated S, while the ground contacts are designated G. It is seen that the ground contacts alternate with the signal contacts on each side of the grounding bus 90. Preferably, each signal contact has a ground contact positioned on opposite side thereof. The grounding bus, together with these two ground contacts, provide a substantially coaxial transmission line arrangement also producing matched impedance characteristics in the connector. Similar, but not quite as effective results, would be achieved by providing a ground contact on only one side of a signal contact. Moreover, in some instances it may not be necessary to provide matched impedance characteristics for a particular signal contact in which case no ground contacts need be mounted adjacent to that signal contact. It will be appreciated that by the present invention, a wide variety ofcircuit design is obtainable, as the designer may select the desired holes 14 and 16 to be plated through and joined either to a signal trace or the ground plane 84, and the desired contact positioning in the holes to meet the particular circuit application.

While the present invention has been described as being incorporated in a printed circuit board connector of the type disclosed in the aforementioned Mattingly et al. patent, it will be appreciated that the invention could be incorporated in any edge card connector by providing a suitable channel in lower end portion of the connector housing for carrying the grounding bus of the present invention, and by utilizing a suitable mounting board as described herein. In addition, while the connector described herein is a double-sided printed circuit board connector, it will be appreciated that the invention could be as easily embodied in a single-sided printed circuit board connector wherein only two rows of plated through holes would be used in the mounting board 12, one row for the ground bus and the other row for the signal and ground contacts. Other modifications and variations within the scope of this invention will be apparent to those skilled in the art.

What is claimed is:

1. An electrical edge connector for a printed circuit board comprising:

a mounting board having a ground plane and a signal trace separated by an insulator, a plurality of plated through holes in said board, a first plated through hole being connected to said trace, and second and third plated through holes being connected to said ground plane;

an elongated insulative connector housing mounted on said board having a slot therein for receiving the edge of a printed circuit board;

electrical contacts in said housing for engaging said printed circuit board edge;

a grounding bus extending lengthwise in said housing below said slot;

a first contact having a mounting portion mounted in said first plated through hole; and

a second contact and said grounding bus having mounting portions mounted in said second and third plated through holes, respectively.

2. A connector as set forth in claim 1 wherein:

said mounting portions of said contacts and said grounding bus have an interference fit with said plated through holes.

3. A connector as set forth in claim 1 wherein:

a row of said third holes is provided in said board in alignment below said slot; and said grounding bus comprises an elongated flat vertically extending metal strip having integral mounting portions depending downwardly therefrom mounted in at least some of said third holes.

4. A connector as set forth in claim 3 wherein:

said housing is formed with a wall positioned over the top of said strip and below said slot.

5. A connector as set forth in claim 1 including:

at least two of said second contacts, said second contacts being positioned in a row on opposite sides of said first contact.

6. A connector as set forth in claim 1 wherein:

there are provided two rows of said contacts in said housing disposed on opposite sides of said grounding bus; and

each said row including at least two of said second contacts and one of said first contacts, said second contacts being positioned on opposite sides of said first contact.

7. A connector as set forth in claim 6 wherein:

each said row includes alternating first and second contacts, with second contacts being located at the ends of each said row.

8. A connector as set forth in claim 1 wherein:

said mounting portions of said first and second contacts and said grounding bus are press fit into said plated through holes; and

said housing is in the form of a hollow unitary shell open at its bottom and overlying said contactsv

Citas de patentes
Patente citada Fecha de presentación Fecha de publicación Solicitante Título
US3399372 *15 Abr 196627 Ago 1968IbmHigh density connector package
US3482201 *29 Ago 19672 Dic 1969Thomas & Betts CorpControlled impedance connector
US3587029 *4 Dic 196922 Jun 1971Litton Precision Prod IncRf connector
US3634806 *31 Oct 196911 Ene 1972Thomas & Betts CorpMatched impedance connector
US3689865 *23 Jun 19705 Sep 1972Texas Instruments IncConnector
US3710303 *13 Sep 19719 Ene 1973Rca CorpEdge connector
US3737838 *17 Nov 19715 Jun 1973IttPrinted circuit board connector
US3778754 *8 Dic 197111 Dic 1973Yamaichi Electric MfgSocket for integrated circuit
Citada por
Patente citante Fecha de presentación Fecha de publicación Solicitante Título
US4146755 *17 Feb 197727 Mar 1979Raoul CausseProtecting for low voltage lines, in particular for telephone networks
US4157612 *27 Dic 197712 Jun 1979Bell Telephone Laboratories, IncorporatedMethod for improving the transmission properties of a connectorized flat cable interconnection assembly
US4223968 *8 May 197923 Sep 1980Tektronix, Inc.High-frequency etched circuit board connector
US4262981 *28 Jun 197921 Abr 1981International Telephone And Telegraph CorporationPrinted circuit board connector
US4381134 *13 Mar 198126 Abr 1983Bell Telephone Laboratories, IncorporatedElectrical connector for plated-through holes
US4381878 *5 Sep 19803 May 1983Siemens AktiengesellschaftContact spring for low resistance connection of a circuit board to a grounded subassembly carrier
US4418972 *1 Feb 19826 Dic 1983Burroughs CorporationElectrical connector for printed wiring board
US4489999 *15 Feb 198325 Dic 1984Motorola, Inc.Socket and flexible PC board assembly and method for making
US4544856 *15 Feb 19841 Oct 1985General Electric CompanyDynamoelectric machine and stator
US4571663 *13 Jun 198318 Feb 1986Ferranti PlcElectrical circuit assemblies
US4616893 *25 Abr 198414 Oct 1986Amp IncorporatedSurface mount, miniature, bussing connector
US4642885 *24 Jul 198517 Feb 1987General Electric CompanyMethod of assembling a stator
US4655535 *3 Jun 19857 Abr 1987Switchcraft, Inc.Jack module and jackfield
US4710133 *19 Jun 19861 Dic 1987Trw Inc.Electrical connectors
US4747787 *9 Mar 198731 May 1988Amp IncorporatedRibbon cable connector
US4758168 *16 Jul 198619 Jul 1988Siemens AktiengesellschaftContact device composed of a plug and a corresponding socket
US4762500 *4 Dic 19869 Ago 1988Amp IncorporatedImpedance matched electrical connector
US4770639 *2 Mar 198713 Sep 1988Switchcraft, Inc.Channelized jackfield
US4797114 *2 Mar 198710 Ene 1989Switchcraft, Inc.Jack circuit board assembly
US4820200 *13 Feb 198711 Abr 1989Switchcraft, Inc.Slab-like jack module
US4840568 *8 Sep 198820 Jun 1989Adc Telecommunications, Inc.Jack assembly
US4881905 *11 Sep 198721 Nov 1989Amp IncorporatedHigh density controlled impedance connector
US4907979 *30 Oct 198513 Mar 1990Amp IncorporatedSurface mount, miniature, bussing connector
US4917616 *15 Jul 198817 Abr 1990Amp IncorporatedBackplane signal connector with controlled impedance
US5004427 *3 May 19902 Abr 1991Labinal Components And Systems, Inc.Electrical connectors
US5057028 *7 Nov 199015 Oct 1991E. I. Du Pont De Nemours And CompanyReceptacle having a nosepeice to receive cantilevered spring contacts
US5061196 *24 May 199029 Oct 1991Weston Roy ESelective shorting of plug pins/socket contacts in an electrical connector
US5112239 *6 Ago 199112 May 1992Yazaki CorporationElectrical connector
US5156554 *22 Jul 199120 Oct 1992Itt CorporationConnector interceptor plate arrangement
US5160273 *24 Jun 19913 Nov 1992Porta Systems Corp.Connector block assembly
US5167514 *5 Nov 19911 Dic 1992Japan Aviation Electronics Industry LimitedPlug and receptacle of a microstrip line connector
US5169324 *11 Oct 19918 Dic 1992Lemke Timothy APlug terminator having a grounding member
US5360346 *22 Dic 19931 Nov 1994Molex IncorporatedElectrical connector assembly with printed circuit board stiffening system
US5597313 *21 Dic 199428 Ene 1997Labinal Components And Systems, Inc.Electrical connectors
US5672062 *11 May 199430 Sep 1997Labinal Components And Systems, Inc.Electrical connectors
US5704795 *3 Jun 19966 Ene 1998Labinal Components And Systems, Inc.Electrical connectors
US5882227 *17 Sep 199716 Mar 1999Intercon Systems, Inc.Controlled impedance connector block
US6015299 *22 Jul 199818 Ene 2000Molex IncorporatedCard edge connector with symmetrical board contacts
US6095821 *22 Jul 19981 Ago 2000Molex IncorporatedCard edge connector with improved reference terminals
US6099328 *21 May 19988 Ago 2000Molex IncorporatedHigh-speed edge connector
US6116926 *21 Abr 199912 Sep 2000Berg Technology, Inc.Connector for electrical isolation in a condensed area
US6139364 *8 Sep 199531 Oct 2000Motorola, Inc.Apparatus for coupling RF signals
US6146203 *31 Jul 199714 Nov 2000Berg Technology, Inc.Low cross talk and impedance controlled electrical connector
US621018211 Jun 19963 Abr 2001Berg Technology, Inc.Low cross talk and impedance controlled electrical connector
US6227882 *20 Mar 19988 May 2001Berg Technology, Inc.Connector for electrical isolation in a condensed area
US632237911 Jul 200027 Nov 2001Fci Americas Technology, Inc.Connector for electrical isolation in a condensed area
US638690926 Ene 199814 May 2002Fci Americas Technology, Inc.Card connector
US6439928 *29 May 199827 Ago 2002Fujitsu Takamisawa Component LimitedHigh density connector for balanced transmission lines
US65336143 Jul 200218 Mar 2003Fujitsu Takamisawa Component LimitedHigh density connector for balanced transmission lines
US68055863 Jul 200219 Oct 2004Fujitsu Takamisawa Component LimitedHigh density connector for balanced transmission lines
US6863548 *4 Jun 20038 Mar 2005Inphi CorporationMethod and apparatus for improving the performance of edge launch adapters
US693917310 Dic 19986 Sep 2005Fci Americas Technology, Inc.Low cross talk and impedance controlled electrical connector with solder masses
US742248322 Feb 20069 Sep 2008Molex IncorproatedDifferential signal connector with wafer-style construction
US744890914 Feb 200511 Nov 2008Molex IncorporatedPreferential via exit structures with triad configuration for printed circuit boards
US75341428 Sep 200819 May 2009Molex IncorporatedDifferential signal connector with wafer-style construction
US763376622 Ago 200815 Dic 2009Molex IncorporatedPreferential via exit structures with triad configuration for printed circuit boards
US764594428 Oct 200512 Ene 2010Molex IncorporatedPrinted circuit board for high-speed electrical connectors
US8636540 *22 Abr 201128 Ene 2014Hon Hai Precision Industry Co., Ltd.Electrical connector grounding path to outer shell
US8727809 *6 Sep 201120 May 2014Samtec, Inc.Center conductor with surrounding shield and edge card connector with same
US20110263157 *22 Abr 201127 Oct 2011Hon Hai Precision Industry Co., Ltd.Electrical connector grounding path to outer shell
US20120252232 *28 Mar 20124 Oct 2012Buck Jonathan EElectrical connector
USRE35508 *8 Dic 199413 May 1997Berg Technology, Inc.Plug terminator having a grounding member
USRE3873617 Ene 200217 May 2005Molex IncorporatedCard edge connector with symmetrical board contacts
DE3017686A1 *8 May 198013 Nov 1980Tektronix IncElektrische verbindungsvorrichtung
EP0243021A1 *1 Abr 198728 Oct 1987Micro Component Technology, Inc.Impedance matching means
EP0454278A2 *16 Nov 198730 Oct 1991The Whitaker CorporationElectrical connector for use on a circuit board
EP0485852A1 *4 Nov 199120 May 1992Japan Aviation Electronics Industry, LimitedPlug and receptacle of a microstrip line connector
EP0602789A2 *29 Oct 199322 Jun 1994The Whitaker CorporationDual read-out SIMM socket for high electrical speed applications
EP0678940A2 *7 Nov 199125 Oct 1995E.I. Du Pont De Nemours And CompanyA plug terminator having a projecting grounding member and a corresponding receptacle having a nosepiece to receive cantilevered spring contacts
EP0801823A1 *11 Ene 199622 Oct 1997Berg Technology, Inc.Shielded memory card connector
EP1721496A2 *14 Feb 200515 Nov 2006Molex IncorporatedPreferential ground and via exit structures for printed circuit boards
WO1988004484A2 *16 Nov 198716 Jun 1988Amp IncImpedance matched electrical connector
WO1992009119A1 *7 Nov 19918 May 1992Du PontA plug terminator having a projecting grounding member and a corresponding receptacle having a nosepiece to receive cantilevered spring contacts
WO1993015534A1 *22 Ene 19935 Ago 1993Du PontA system and connectors for the electrical interconnection of component boards
WO2005081596A2 *14 Feb 20051 Sep 2005Molex IncPreferential ground and via exit structures for printed circuit boards
Clasificaciones
Clasificación de EE.UU.439/62, 439/49, 439/109, 439/607.7, 439/947
Clasificación internacionalH05K7/14, H01R13/00, H01R12/16, H01R12/18, H01R12/04, H05K7/02
Clasificación cooperativaH05K7/02, H01R13/00, H01R23/688, Y10S439/947
Clasificación europeaH01R13/00, H05K7/02, H01R23/68D2
Eventos legales
FechaCódigoEventoDescripción
22 Abr 1985ASAssignment
Owner name: ITT CORPORATION
Free format text: CHANGE OF NAME;ASSIGNOR:INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION;REEL/FRAME:004389/0606
Effective date: 19831122